(19)

(11)

EP 1 658 620 A1

(12)

(43) Date of publication: 24.05.2006 Bulletin 2006/21 (21) Application number: 04775350.4 (22) Date of filing: 30.08.2004

(51) International Patent Classification (IPC):  G21C 7/00(1968.09) G21C 7/08(1968.09) (86) International application number: PCT/SE2004/001244 (87) International publication number: WO 2005/022551 (10.03.2005 Gazette 2005/10)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR (30) Priority: 28.08.2003 SE 0302308 (71) Applicant: Westinghouse Electric Sweden AB 721 63 Västerås (SE)	(72) Inventors: HELMERSSON, Sture S-730 40 Kolbäck (SE) BECCAU, Pär S-722 44 Väster s (SE) (74) Representative: Berglund, Stefan  Bjerkéns Patentbyra KB Östermalmsgatan 58 114 50 Stockholm 114 50 Stockholm (SE)